OVSDriver: support OF 1.3 dscp/ecn matches
OVSDriver: support OF 1.3 tcp/udp src/dst port matches
OVSDriver: refactor version-specific match translation
OVSDriver: support OF 1.3 ICMP type/code matches
OVSDriver: support OF 1.3 ARP op/spa/tpa matches
OVSDriver: support OF 1.3 IPv6 proto/dscp/ecn matches
OVSDriver: support OF 1.3 icmpv6 type/code matches
OVSDriver: implement OF 1.3 IPv6 matching

This doubles the size of the CFR, so we should optimize the non-IPv6 case
later.
OVSDriver: include IPv6 addrs when dumping CFR
Merge into master from pull request #31:
implement all required OpenFlow 1.3 match fields (https://github.com/floodlight/ivs/pull/31)